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Old 07-20-2016, 09:26 PM   #1
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trailer brakes

Will trailer brakes work if I don't have trans in tow/haul mode?Truck is 2015 GMC sierra.
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Old 07-20-2016, 09:36 PM   #2
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Yes. They work when plugged into truck. Trans mode just changes some internal settings of shifting stuff. Your brakes are controlled by the brake controller. For me built in, if after market mine were always wired to the brake light wire / switch on the pedal.
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Old 07-21-2016, 07:44 AM   #3
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Also tow-haul mode will signal the TV's computer to increase voltage to help charge (keep charged) the trailer's battery(ies).
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Old 07-21-2016, 08:00 AM   #4
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Quote:
Originally Posted by f5moab View Post
Also tow-haul mode will signal the TV's computer to increase voltage to help charge (keep charged) the trailer's battery(ies).
Interesting. Did not know that. Thanks.
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Old 07-21-2016, 08:47 AM   #5
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From a 2015 Silverado owner's manual (GMC would be the same, just a different name); page 9-93

If charging a remote (non-vehicle)
battery, press the Tow/Haul Mode
button, if equipped, at the end of the
shift lever. This will boost the
vehicle system voltage and properly
charge the battery. If the trailer is
too light for Tow/Haul Mode, or the
vehicle is not equipped with Tow/
Haul, turn on the headlamps as a
second way to boost the vehicle
system and charge the battery.



Since I tow a 3200 lb popup, I do not use tow/haul mode, but I do run with the headlamps on. Not just to charge the battery, but to light up all the lights on the trail.

Toyota might do the same????
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Old 07-21-2016, 05:36 PM   #6
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I'll have to check that out. 😱
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Old 07-21-2016, 05:54 PM   #7
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Quote:
Originally Posted by f5moab View Post
Also tow-haul mode will signal the TV's computer to increase voltage to help charge (keep charged) the trailer's battery(ies).
Also changes your turn signals from 3 flashes to 6 flashes if you just touch the stalk.
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Old 07-21-2016, 07:05 PM   #8
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Quote:
Originally Posted by f5moab View Post
Also tow-haul mode will signal the TV's computer to increase voltage to help charge (keep charged) the trailer's battery(ies).
Mine will charge the battery without using tow haul mode
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Old 07-21-2016, 07:16 PM   #9
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Quote:
Originally Posted by dcheatwood View Post
Interesting. Did not know that. Thanks.
X2
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Old 07-21-2016, 08:03 PM   #10
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Quote:
Originally Posted by f5moab View Post
From a 2015 Silverado owner's manual (GMC would be the same, just a different name); page 9-93

If charging a remote (non-vehicle)
battery, press the Tow/Haul Mode
button, if equipped, at the end of the
shift lever. This will boost the
vehicle system voltage and properly
charge the battery. If the trailer is
too light for Tow/Haul Mode, or the
vehicle is not equipped with Tow/
Haul, turn on the headlamps as a
second way to boost the vehicle
system and charge the battery.



Since I tow a 3200 lb popup, I do not use tow/haul mode, but I do run with the headlamps on. Not just to charge the battery, but to light up all the lights on the trail.

Toyota might do the same????

Thanks,I did not know that.
I do have utility trailer and it only weight 1,500 lb empty.
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